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针灸治疗瘾疹，应主选哪组经穴为主( )
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A new variety of sugar cane, bred from crosses of ordinary cultivated strains with a wild type found in Argentina, could become an important source of energy as well as sugar. Two conditions need to be fulfilled to make it worthwhile to cultivate an agricultural crop for energy. The crop must be easy to harvest and process, and it must be high-yielding. On both these counts, sugar cane is ideal: the technology for harvesting and milling has been thoroughly tested over the years, and sugar cane is one of the most productive plants ever recorded. Professor Mike Giamalva and his colleagues at Louisiana State University have now produced a plant that is super-productive. Their new variety grows to 3.6 metres high. On experimental plots, it gives yields of 253 tons per hectare -equal to the highest yield of any plant recorded. But even this record has been exceeded. On good soil, yields may reach 321 tons per hectare. Another advantage of Giamalva’s new strain of sugar cane is its high fibre content. Traditionally, researchers have selected strains that produce large amounts of juice rich in sugar, and low quantities of fibre. The fibre is either discarded, or sometimes burnt as fuel. The new sugar cane gives exceptional quantities of fibre for only modest amounts of juice. When it comes from the mill, the bagasse has about 70 per cent of the heat content of wood, or 30-40 per cent of that of coal. Burning bagasse to provide energy is not a new idea. Many sugar factories throughout the world are now self-sufficient in energy, while some, for example, in Mauritius, Hawaii and South Africa, "export" electricity to the national grid. Mauritius currently gets around 10 per cent of its electricity from sugar factories. However, in Louisiana local farmers are unwilling to grow the cane until they have a guaranteed market. Yet industrialists will not invest in the new fuel until they have a constant supply. And only local factories may be able to exploit cane because, being bulky, it is costly to transport. One way of overcoming this problem would be to dry the fibrous residue and compact it. Work on compacting fibrous residue is now under way in several research centres. Whether compacting will pay its way will depend on the local situation and the cost of alternative energy supplies. A study carried out by Fay Baguant from the University of Mauritius showed that electricity could be produced there from fibrous residue about twice as cheaply as from oil or coalfired stations. The new variety can be grown with ordinary sugar cane or with other crops to provide energy for processing. It can be compressed and burned as a substitute for charcoal. Or it can be incorporated into paper, cardboard and fibreboard. Brazil, with its fleet of cars running almost entirely on alcohol fuel extracted from sugar cane, already has shown that the plant has the potential to alter radically a country’s agricultural sector. What does"bagasse" in line 6, paragraph 4 mean
肛门外括约肌（）。
One of the greatest economic and social changes of the post-war years has gone largely unnoticed. It is that more and more women are going out to work. Today in the United States, in Japan and in the United Kingdom, almost 40 per cent of the work force is female. 16. ______ Most women now work far longer hours than men -in factory, shop or office as well as in the home as cook, cleaner, child rearer, shopper and home-maker. This "double burden" means that the average woman who goes out to work is now putting in an 80-hour working week -twice as long as most men. So equality depends not only on women sharing in paid employment but also on men sharing in the tasks of the home. At the moment husbands in all industrialised countries contribute very little to domestic work and recent research shows that this contribution does not increase when the wife goes out to work. American researcher Joan Vanek, for example, found that the average father in the United States spends only 12 minutes a day with his children. Overall, women’s unpaid work in the U.S.A. is estimated at about 40 per cent of the Gross Domestic Product. 17. ______ The reasons why women earn less than men go deeper than legislation. And again the main cause is the double burden’ of home responsibilities which means that many women have to take part-time jobs, or less demanding jobs, and that they have less time for training and less opportunity for promotion. As children, girls are educated and conditioned either for no employment at all or for more manial and lower-paid jobs. As workers, they are crowded into industries like textiles, food, clothing, retailing -where they compete with each other for low-paid and insecure jobs which require little skill or training and offer little chance of promotion. A recent survey in Sweden shows that women have a choice of about 25 different occupations whereas a man chooses from over 306 careers. Indeed certain countries, says the OECD, "have come to rely on a supply of female labour which costs little and enjoys little protection". 18. ______ Single parent families are increasing in almost every industrialised country. In Britain at least 600,000 families are now headed by single mothers and the number is growing by 6 per cent a year. The main cause is the rise in divorce rates which have doubled in many countries during the last 15 years. 19. ______ As the ILO notes, pensioners are the poorest social group in the industrialised world. But here too it is the women who are worst off -partly because they tend to live longer than men and partly because inequality during their working lives is reflected in reduced pensions. In the United States, for example, the 8 million women who are over the age of 65 make up by far the poorest group of people in America -with almost half of them living below the official poverty line. 20. ______ The first half of the U.N. Decade for Women has now gone and the vast majority of women in the industrialised countries have seen little or no benefit. Equal-pay legislation in almost all industrialised countries has been one of the big achievements of these five years. The task for the next five years is to achieve equal work which will give substance to equal pay. The biggest barrier is that working women now do two jobs. And overcoming that barrier is as much of a challenge to men as it is to women.A. But even in the work-place itself, women’s wages are everywhere lower than men’s. In the U.K., women are paid an average of 25 per cent less. In the U.S.A., they are paid 40 per cent less. And this is despite equal pay legislation in most industrialised countries.B. The result of this inequality is that women have more than their fair share of poverty. And particularly hard-hit are the families dependent on a woman’s earnings.C. In theory this should mean that women are becoming better-off, liberated, equal. But in practice it is a different story.D. For women at work, the final irony is that the trade unions -which have done so much to improve the pay, conditions and benefits of work forces in the industrialised world -are also dominated by men. In America’s garment industry, 80 per cent of the union members are women but 21 of the 22-member board of the union are men. In New Zealand only 15 of the country’s 323 unions have any women executives despite the fact that women carry over a third of all union membership cards.E. It is these single-parent families, says the International Labour Organisation, which make up the fastest rising group in any classification of the poor population. Even after the receipt of benefits, the incidence of poverty is only just below that of pensioners and is much higher than in any other group.F. In the case of younger women, such work loads are commonly combined with frequent pregnancy, childbirth and breast-feeding I exhausting processes for any woman’s body, but particularly debilitating when compounded by inadequate food and long hours of back-breaking work in the fields.
细菌在血中大量繁殖是（）。
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